1. William R. Pritchard Veterinary Medical Teaching Hospital; University of California Davis; 1 Garrod Drive Davis CA 95616 USA
2. Department of Veterinary Medicine and Epidemiology; School of Veterinary Medicine; University of California Davis; 1 Garrod Drive Davis CA 95616 USA
3. Department of Veterinary Pathology Microbiology and Immunology; School of Veterinary Medicine; University of California Davis; 1 Garrod Drive Davis CA 95616 USA
4. Department of Population Health and Reproduction; School of Veterinary Medicine; University of California Davis; 1 Garrod Drive Davis CA 95616 USA